Method of detoxification treatment for filter with persistent substance adhering thereto

Inactive Publication Date: 2009-05-14
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0038]According to the invention, a filter used in a treatment system of hardly-decomposable-substance-containing water and having a hardly decomposable substance adhering thereto can be detoxified on site and discarded safely.
[0039]In particular, by combining the invention with the aforementi

Problems solved by technology

However, these separating and removing techniques are not preferable since they are not only inefficient but also require a great deal of equipment investment since a diluted liquid is directly treated.
Further, when discharged water is badly contaminated, there may be some unfavorable cases where the emission standard value cannot be fulfilled even though the above techniques have been applied.
In this case, however, activated carbon that has once adsorbed a hardly decomposable substance still holds the hardly decomposable substance internally, and therefore, it cannot be discarded as it is.
However, this method involves the risk that an adsorbate may be discharged together with a discharged gas to cause secondary pollution, or may seep out from the land where it is filled to cause re-contamination.
Therefore, while some methods can be easily applied, others cannot be easily applied, depending upon the state of existence of a hardly decomposable substance.
For example, thermal decomposition or decomposition using supercritical water requires expensive facilities or energy, and there are many cases where they cannot be put into practice from an economical viewpoint.
Further, a method using a combination of ozone or hydrogen peroxide with ultraviolet light cannot be applied to a suspension that does not easily transmit ultraviolet light or a solid such as soil or sludge.
In general, harmful substances such as an endocrine-disrupting chemical cause a problem that, as operation becomes complicated, possibility of re-conta

Method used

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  • Method of detoxification treatment for filter with persistent substance adhering thereto
  • Method of detoxification treatment for filter with persistent substance adhering thereto
  • Method of detoxification treatment for filter with persistent substance adhering thereto

Examples

Experimental program
Comparison scheme
Effect test

Example

Example 1

FIG. 1

[0104]A microfiltration membrane (MF membrane) with dioxins adhering thereto was detoxified using the treatment apparatus shown in FIG. 1.

[0105]A hot water bath (volume: 1 L) (heat exchanger) heated to 95° C. was provided between a preparation tank (volume: 2 L) and a treatment tank (volume: 0.5 L). The preparation tank was connected to the treatment tank, through a hot water bath, with a Teflon (registered trademark) tube with a diameter of 0.5 cm. The lower part of the treatment tank was also connected to the preparation tank with a Teflon (registered trademark) tube. A tube pump was provided between the preparation tank and the hot water bath, and between the treatment tank and the preparation tank to allow a downwardly flowing stream to be generated in the treatment tank, as well as to allow the liquid to circulate.

[0106]A microfiltration membrane (MF membrane) with a diameter of 11 cm and a pore size of 0.45 μm contaminated with dioxins (dioxin concentration: 650...

Example

Example 2

[0108]Using the treatment apparatus shown in FIG. 2-1, a pleated type filter with dioxins adhering thereto was detoxified.

[0109]A heat exchanger and a pump were provided between a preparation tank (10 L) and a filter contaminated with dioxins (dioxin concentration: 10000 pg-TEQ / g, pleated type, pore diameter: 2 μm, membrane area: 0.15 m2). A switchover valve was provided between the ejection port of the pump and the filter, whereby line A (a line which is normally used) running from the inlet of the filter to the outlet of the filter, and line B running from the outlet of the filter to the inlet of the filter were provided. As a result, the flow direction of the aqueous persulfate solution (chemicals) could be changed reversibly.

[0110]Sodium persulfate was successively added to the preparation tank every 24 hours in such a manner that the concentration of sodium persulfate became 3% within 2 hours. The liquid temperature was kept at 80° C., and the flow direction of the aqu...

Example

Example 3

[0112]Using the treatment apparatus shown in FIG. 2-2, a hollow fiber type filter with dioxins adhering thereto was detoxified.

[0113]A heat exchanger and a pump were provided between a preparation tank (100 L) and a filter contaminated with dioxins (dioxin concentration: 8000 pg-TEQ / g, hollow fiber type, cartridge Φ 16.5 cm, length 106.6 cm). Lines (1) to (7) were provided around the filter, and a valve was provided at a branch of each line. Combination of opening and closure of the valves was as follows.

1. The valves of lines (1), (5) and (7) are open with the valves of lines (2), (3), (4) and (6) being closed

2. The valves of lines (2), (4), (5) and (6) are open with the valves of lines (1), (3) and (7) being closed

3. The valves of lines (2), (3), (6) and (7) are open with the valves of lines (1), (4) and (5) being closed

[0114]The flow channel and liquid flow in 1 above are shown in FIG. 4-1, the flow channel and liquid flow in 2 above are shown in FIG. 4-2, and the flow c...

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Abstract

A method for detoxifying a filter including the step of subjecting a filter with a hardly decomposable substance adhering thereto to chemical decomposition without desorbing the hardly decomposable substance from the filter.

Description

TECHNICAL FIELD[0001]The invention relates to a method for detoxifying a filter with a hardly decomposable substance adhering thereto which is used in treating water containing a hardly decomposable substance such as dioxins and other endocrine-disrupting substances.BACKGROUND[0002]In Japan, a law concerning special measures against dioxins was enacted in 1999, which regulates the emission standard value of dioxins to 10 pg-TEQ / L or less. However, discharged water caused by the demolition of incinerators, discharged water from particular industrial institutions, or part of water seeping from soil may contain dioxins at a concentration larger than the regulated amount. Therefore, development of a technology for reducing or removing dioxins is strongly desired.[0003]Other than dioxins, endocrine-disrupting substances (the so-called environmental endocrine disrupters or endocrine-disrupting chemicals) such as bisphenols, and various organic chlorine compounds represented by trichloroet...

Claims

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Application Information

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IPC IPC(8): B09B3/00A62D3/38B01D65/02
CPCB01D65/02B08B3/08B01D2321/28B01D2321/168A62D3/00B09B3/00
Inventor MURAMOTO, TAKAHISAMORIMITSU, KOZOMACHIDA, MASASHIYOSHIOKA, YOSHIYUKI
Owner IDEMITSU KOSAN CO LTD
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